×

Picture processing method in optical measuring apparatus

  • US 5,311,289 A
  • Filed: 08/28/1992
  • Issued: 05/10/1994
  • Est. Priority Date: 09/09/1991
  • Status: Expired due to Fees
First Claim
Patent Images

1. A picture processing method in an optical measuring apparatus which comprises a projector for radiating a slit light on a workpiece, and an image sensing device for picturing an optical cross-sectional image drawn by said slit light radiated on the workpiece, an optical axis of said slit light and an optical axis of said image sensing device being disposed in such a positional relationship as to cross each other at an oblique angle,said method comprising the steps of:

  • setting windows at predetermined positions of the optical cross-sectional image on a screen of said image sensing device; and

    measuring a position of center of gravity of each optical cross-sectional image in each of said windows;

    wherein an amount of displacement in an X-axis direction of said optical cross-sectional image on said screen is measured, said X-axis being defined to be such a coordinate axis of said screen as to correspond to said optical axis of said slit light;

    a rate of magnification of said optical cross-sectional image in a Y-axis direction is calculated from said amount of displacement, said Y-axis being defined to be perpendicular to said X-axis; and

    at lest setting positions of said windows in the Y-axis direction and sizes thereof in the y-axis direction are changed depending on said rate of magnification.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×